Takeup mechanism for weaving loom

ABSTRACT

A weaving loom, in which a sand beam cooperates with at least one auxiliary beam for guiding the cloth, said auxiliary beam being movably supported in such a way, that the force exerted on said beam due to the tension in the cloth tends to press the auxiliary beam against the sand beam.

United States Patent Geven et al.

[ 1 Feh.29,1972

[54] TAKEUP MECHANISM FOR WEAVING DOOM [72] inventors: Pieter TheodorusGeven, Molenstraat 83, van Mullekom; Peter Hubert, Voortseweg l l,Deurne, both of Netherlands [22] Filed: Mar. 19, 1970 [21] Appl.No.:21,034

[30] Foreign Application Priority Data Apr. 2, 1969 Netherlands ..6905194 [52] US. Cl ..139/308 [5 1] Int. Cl. [58] Field of Search 1 39/307,308, 304; 242/66 [56] References Cited UNITED STATES PATENTS 2,776,6771/1957 Paqnette ..l39/304 2,293,666 8/1942 Santon ..l39/307 2,226,090l2/l940 Burdett.....

2,276,790 3/1942 Palmer .11.. 1 39/307 FOREIGN PATENTS OR APPLICATIONS474,244 9/1952 Italy ..139/3o4 232,447 3/1964 Austria 649,844 l2/l928France ..l39/308 Primary Examiner.l ames Kee Chi Attorney-Marshall &Yeasting [5 7] ABSTRACT A weaving loom, in which a sand beam cooperateswith at least one auxiliary beam for guiding the cloth, said auxiliarybeam being movably supported in such a way, that the force exerted onsaid beam due to the tension in the cloth tends to press the auxiliarybeam against the sand beam 1 Claims, 1 Drawing Figure TAKEUP MECHANISMFOR WEAVING LOOM BACKGROUND OF THE INVENTION DESCRIPTION OF THE PRIORART This invention relates to a weaving loom of the type in which a sandbeam cooperates with an auxiliary beam for guiding the cloth inengagement with a large portion of the circumference of the sand beam. Aloom of this type is disclosed in copending application U.S. Ser. No.758,861, filed Sept. 10, 1968 now US. Pat. No. 3,532,137. The use of anauxiliary beam cooperating with the sand beam permits the cloth to beout between the sand beam and the cloth beam and thereafter the clothbeam to be removed (e.g., when it has been filled completely with therolled-up cloth) without the need of stopping the loom for this purpose.In the prior construction locking means are used for holding theauxiliary beam in its operative position relative to the sand beam.

OBJECT OF THE INVENTION It is a main object of the present invention tovimprove a weaving loom of the above type in such a way that in operationthe auxiliary beam will be drawn in engagement with the sand beam in apositive manner, without making use of particular pressing means.

Accordingly the present invention provides a weaving loom, comprising asand beam around which the cloth travels, and at least one auxiliarybeam which is arranged adjacent to the sand beam so as to cause thecloth to travel between the sand beam and the auxiliary beam, theimprovement consisting in the auxiliary beam being movably supported insuch a way that the force exerted on said beam due to the tension in thecloth tends to press the auxiliary beam against the sand beam.

In a preferred embodiment each auxiliary beam cooperating with the sandbeam is rotatably mounted between two support arms swingably mountedabout an axis that is so situated with regard to the sand beam that theauxiliary beam may be swung away from the sand beam so as to provideaccess to the surfaces of both the sand beam and the auxiliary beam.

In accordance with a further preferred feature one auxiliary beam islocated at the cloth entrance side of the sand beam and a secondauxiliary beam is positioned at the cloth delivery side of the sandbeam.

Advantageously at least the auxiliary beam at the cloth delivery side isdriven with the intermediary of a slip coupling. As a result thereof thecloth may be severed between said auxiliary beam at the delivery sideand the cloth beam and the cloth beam may be removed while the clothproceeds moving taut against the sand beam.

BRIEF DESCRIPTION OF THE DRAWING The drawing is a schematic view of partof a loom comprising the sand beam and the associated auxiliary beams.

DESCRIPTION OF THE PREFERRED EMBODIMENT In the loom the cloth 1 movesfrom the weaving shed (not shown) over the breast beam 2 and the sandbeam 3 to the cloth beam 4 onto which the cloth is wound. The sand beam3 is driven by a drive mechanism 5, partly and schematically shown, at arate which is a function of the weaving speed of the loom. The sand beam3 has a rough surface to provide reliable friction between the cloth Iand the surface of the sand beam 3.

In the embodiment shown the sand beam cooperates with two auxiliarybeams 6 and 7. The cloth arriving from the breast beam 2 passes aroundthe auxiliary beam 6 and along the back of the sand beam 3 to theauxiliary beam 7. Thereafter the cloth moves around said auxiliary beam7 to the cloth beam 4. Thereby the cloth forms a loop la between theauxiliary beams 6 and 7 in which loop the sand beam 3 is located. Theloop la of the cloth lies taut around the sand beam 3 and around theauxiliary beams 6 and 7. The cloth is taut around the auxiliary beam 6because of the tension force on the cloth in the warp direction which isgenerated by the sand beam 3. The tension in the cloth in the portionbetween the auxiliary beam 6 and the weaving shed (not shown) is ameasure for the quality of the fabric, while the linear speed of thecloth derived from the rotational speed of the sand beam 3 is a measurefor the number of wefts per given warp length. The cloth is taut aroundthe auxiliary beam 7 because of the cloth being wound onto the clothbeam 4 and because said cloth beam is driven preferably with an excessin speed i.e., the cloth beam is driven so that the cloth between theauxiliary beam 7 and the cloth beam periphery is always taut. The clothbeam may be driven with the intermediary of a belt 10 guided aroundpulleys 8 and 9. Preferably the belt 10 is allowed to slip in thepulleys 8 and 9 so as to keep the tension in the cloth between theauxiliary beam 7 and the cloth beam periphery at the correct value. Thetension in this portion of the cloth is not critical for the fabricquality provided the cloth in the loop la lies taut around the sand beam3. Instead of a slipping belt 10 also a separate slip coupling 11 may beapplied as a connect ing means between the shaft 12 of the sand beam andthe belt pulley 8. The amount of slippage in the slip coupling 11 may beadjusted at will.

In order to keep the auxiliary beam 6 well engaged with the periphery ofthe sand beam 3, the auxiliary beam 6 is supported by pivoting arms 13aand 13b, which tend to press the beam 6 against the periphery of thesand beam under the action of the tension in the cloth. The arms 13a,13b are pivotally mounted on a support shaft 14 located near the breastbeam 2. The auxiliary beam 7 is likewise supported by pivoting arms 15aand 15b. In the embodiment shown the pivoting arms 15a, 15b likewisepivot around the support shaft 14 but they may also pivot around aseparate shaft. With the location of the pivot axis shown in the drawingnot only the tension in the cloth draws the auxiliary beams 6 and 7against the sand beam 3 but also the weight of the auxiliary beams 6 and7 and the weight of the pivoting arms 13a, 13b and 15a, 15b will assistin keeping the beams well engaged with the surface of the sand beam.Therefore the pivot axis of the pivoting arms 13a, 13b and 15a, 1512 hasto be such that a force generated by the tension of the cloth on theauxiliary beams 6 and 7 has a component tending to press the auxiliarybeams 6 and 7 against the sand beam 3.

When a new cloth or mat of warp threads has to be applied around thesand beam 3 the auxiliary beams 6 and 7 may be swung upwardly to provideaccess to the surfaces of the auxiliary beams 6 and 7 and the surface ofthe sand beam 3. The auxiliary beams may be locked in their upwardposition as by means of pawls 16 extending behind cams 17 of thepivoting arms 13a and 150. After disengaging the pawls 16 the respectiveauxiliary beams may again be brought in their operative positions.

The application of the auxiliary beams 6 and 7 results in such a goodapplication of the cloth against the periphery of the sand beam 3 thatthe cloth may be severed between the auxiliary beam 7 and the cloth beam4, for instance when a full beam has to be removed from the loom,without the necessity of stopping the loom. The cloth hanging down fromthe auxiliary beam 7 then hangs completely free until a sufficientlength is obtained enabling it to be wound on a new empty beamwhereafter the new cloth beam is against suspended in its journals inthe loom. For some kind of cloth it may be preferable to drive theauxiliary beam 7 as well, for instance by means of a gear (not shown) onthe auxiliary beam 7 engaging the gear 18 on the sand beam, if necessarywith application of a slip coupling. It is also possible to apply a beltin the same manner as the belt 10 to drive the auxiliary beam 7 ifdesired.

We claim:

1. A weaving loom comprising a driven sand beam having a frictionsurface for driving engagement with a cloth, woven by the loom, and adriven cloth beam for winding up the cloth leaving the sand beam,wherein the improvement comprises a cloth extending around one auxiliarybeam, then around the sand beam, and then around the other auxiliarybeam to the cloth beam has a component which presses each auxiliary beamagainst the sand beam.

1. A weaving loom comprising a driven sand beam having a frictionsurface for driving engagement with a cloth, woven by the loom, and adriven cloth beam for winding up the cloth leaving the sand beam,wherein the improvement comprises two auxiliary beams, each of whichextends parallel to the sand beam and is rotatably carried by a supportthat is pivoted upon an axis extending above and parallel to the sandbeam, each auxiliary beam being free to pivot by gravity with itssupport through an arc which intersects the sand beam, and the locationsof the auxiliary beams being such that the tension in a cloth extendingaround one auxiliary beam, then around the sand beam, and then aroundthe other auxiliary beam to the cloth beam has a component which presseseach auxiliary beam against the sand beam.